Butter stick



FIG. 1 is a front, top and left side perspective view of a butter stick;

FIG. 2 is a top plan view thereof, the bottom plan view being a mirror image thereof;

FIG. 3 is a front elevation view thereof, the back elevation view being a mirror image thereof; and,

FIG. 4 is a right side elevation view thereof, the left side elevation view being a mirror image thereof.

The evenly-spaced broken lines shown in FIGS. 1-4 illustrate portions of the butter stick that form no part of the claimed design. The dot-dash broken lines shown in FIGS. 1-4 illustrate the boundary of the claimed design that forms no part thereof. Any portions of the article between the break lines form no part of the claimed design. 

CLAIM The ornamental design for a butter stick, as shown and described. 